Hydrogen-induced cracking at grain and twin boundaries in an Fe-Mn-C austenitic steel

Motomichi Koyama, Eiji Akiyama, Takahiro Sawaguchi, Dierk Raabe, Kaneaki Tsuzaki

Research output: Contribution to journalArticlepeer-review

173 Citations (Scopus)


Hydrogen embrittlement was observed in an Fe-18Mn-1.2C (wt.%) steel. The tensile ductility was drastically reduced by hydrogen charging during tensile testing. The fracture mode was mainly intergranular fracture, though transgranular fracture was also partially observed. The transgranular fracture occurred parallel to the primary and secondary deformation twin boundaries, as confirmed by electron backscattering diffraction analysis and orientation-optimized electron channeling contrast imaging. The microstructural observations indicate that cracks are initiated at grain boundaries and twin boundaries.

Original languageEnglish
Pages (from-to)459-462
Number of pages4
JournalScripta Materialia
Issue number7
Publication statusPublished - 2012 Apr


  • Austenitic steel
  • Electron backscattering
  • Hydrogen embrittlement
  • Tension test
  • Twinning


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